- The ruler is marked in centimeters (cm), with each numbered mark representing one centimeter.
- Between each centimeter mark, there are 10 smaller divisions, which represent millimeters (mm). Therefore, each small division is 0.1 cm.
- The left end of the blue line aligns with the 0 cm mark on the ruler.
- The right end of the blue line extends past the 4 cm mark and stops at the fifth small division after it.
- The measurement is calculated as 4 cm plus 5 mm.
- Since 5 mm is equal to 0.5 cm, the total length is 4 cm + 0.5 cm = 4.5 cm.
Parent Tip: Review the logic above to help your child master the concept of reading rulers worksheet.